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My computer (desktop) has crashed while I normaly navigating the web. Since this occured, it no entry in Ubuntu, only on windows (by Grub menu).

The problem is as follow:
- I try to run Ubuntu X.X-X-generic, as well as old versions, and a message appears:
errors: symbol not found: 'grub_file[strange_char]filters_enabled'
errors: symbol not found: 'grub_file[strange_char]filters_enabled'

PS: [strange char] is a not legible char

- I try to run LiveCD (11.04 and 12.04) (for grub recovery or reinstall Ubuntu): the system shows the menu options from CD, but any executes... the system reboots in few seconds later I press <enter>... always, for any option.

I wanna recover my system, preferably, or install a new Ubuntu.
Any help will welcome.

What does "crash" mean in this instance?
Did it freeze? shutdown? physically fall of the desk?
Were you using Ubuntu when this happened?
Were you using windows when this happened?
If I understand correctly, you are saying that you now see the Grub menu and it only has an entry for windows and none for Ubuntu, correct?

Quote:

the system shows the menu options from CD

Does that mean the CD boots and you see whatever options the Ubuntu CD has, Try without installing, install or whatever?

What does "crash" mean in this instance?
Did it freeze? shutdown? physically fall of the desk?
Were you using Ubuntu when this happened?
Were you using windows when this happened?
If I understand correctly, you are saying that you now see the Grub menu and it only has an entry for windows and none for Ubuntu, correct?

Hello!

Crash = freeze, than reboot self;
I was using Ubuntu when this happeded;
In the Grub menu, appears all menu entries normally... but when I choose any Ubuntu option, it reboots as explaned.
Only the option to start windows works correctly.

[/QUOTE]Does that mean the CD boots and you see whatever options the Ubuntu CD has, Try without installing, install or whatever?[/QUOTE]
I try without installing and installing, but both options results in same situation: the sysmtem reboots.

In the Grub menu, appears all menu entries normally... but when I choose any Ubuntu option,

So you do see the Grub menu, correct?
No Ubuntu option you see and select boots, correct?
Selecting xp does boot xp, correct?
In your first post, you said you saw no entry for Ubuntu so which is it?

It seems you have two problems here. One, you can't boot Ubuntu from your hard drive so your bootloader may be messed up but it could be other things.
Second problem is that when you boot from your CD drive, it fails to boot the CD and reboots itself. Is that correct? Have you tried other CDs, just a data CD or a movie to see that the drive reads and works. You might try that in windows to verify the drive is OK. I've seen posts on this reboot problem with Ubuntu before but don't recall the solution. Someone else should come along with more info.

To clarify the question:
Rob.rice: I already do it. But the system never boots.

Yancek: sorry, I express me wrong in that post.
I meant to tell Ubuntu will not boot.

Well, all you found is correct.
And the CD drive is ok. I tried with two versions of Ubuntu (11.04, 12.04)

But...
This problem occurred on my work computer.
Therefore, since Friday I did not take more attempts.
Today, Monday, turning on the computer and make one more attempt before formatting the HD, to my surprise, the Ubuntu booted normally, as if nothing had happened.
I was perplexed when I saw it ...
But the system is unstable, often locking and restarting ...
I will format the Ubuntu partition and reinstall it.
Anyway, thank you for the attention of gentlemen to help me solve the problem.

Before going any further make a backup of your important files (which you should have anyways) and test the hardware, especially RAM (use Memtest86+) and the harddisk (use the manufacturers diagnosis tool).